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                <a href="/categories/Ionic"><b>「
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                三月 19, 2017
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            <h3 class="post-title animated fadeInDown"><a href="/2017/03/19/ionic/comfirm-password-validators.html" title="IONIC 2 - 确认密码">IONIC 2 - 确认密码</a>
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                    <span class="animated fadeIn delay-1s">开发过程中一般在注册或者修改密码都要写一个密码确认的表格, 这篇文章就是记录怎么在Ionic2里面使用FormBuilder和Validators判断密码是否一致.</span>
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            <p>开发过程中一般在注册或者修改密码都要写一个密码确认的表格, 这篇文章就是记录怎么在Ionic2里面使用<strong>FormBuilder</strong>和<strong>Validators</strong>判断密码是否一致.</p>
<p>首先这篇文章是默认您已经了解怎么使用<strong>Angualr2</strong>的<strong>FormBuilder</strong>和<strong>Validator</strong>, 如果你还没了解这两个类的用法可以前去看<a href="https://ionicframework.com/docs/v2/resources/forms/" target="_blank" rel="noopener">Ionic2的文档</a></p>
<h1 id="实例一个FormGroup"><a href="#实例一个FormGroup" class="headerlink" title="实例一个FormGroup"></a>实例一个<code>FormGroup</code></h1><blockquote>
<p>第一步首先我们需要实例了FormBuilder的一个FormGroup</p>
</blockquote>
<ul>
<li>这里我们定义了passwordForm的这个表格里面的input.</li>
<li>在最后我们加入了自定义认证方法 { validator: AdvanceValidator.matchingPasswords(‘password’, ‘rePassword’) }</li>
<li>这里我们把password, 和rePassword 传给了 AdvanceValidator 方法, 这里传的是密码和确认密码在FormGroup里面定义的名字.</li>
<li>现在我们看看这个password.ts怎么写.</li>
</ul>
<pre><code class="typescript">import { FormBuilder, Validators, FormGroup } from &#39;@angular/forms&#39;;
import { AdvanceValidator } from &#39;../../validators/advance-validator&#39;;

@Component({
  selector: &#39;page-password&#39;,
  templateUrl: &#39;password.html&#39;
})

//密码修改页
export class PasswordPage {
  passwordForm: FormGroup;

  constructor(private fb: FormBuilder) 
  {

    this.passwordForm = fb.group({
        username: [&#39;&#39;, Validators.required],
        password: [&#39;&#39;, Validators.compose([Validators.maxLength(30), Validators.minLength(7), Validators.required])],
        rePassword: [&#39;&#39;, Validators.compose([Validators.maxLength(30), Validators.minLength(7), Validators.required])],
    }, { validator: AdvanceValidator.matchingPasswords(&#39;password&#39;, &#39;rePassword&#39;) });

  }
}</code></pre>
<h1 id="创建自定义认证器"><a href="#创建自定义认证器" class="headerlink" title="创建自定义认证器"></a>创建自定义认证器</h1><ul>
<li>我们首先在项目根目录创建 <strong>validators</strong> 的文件夹</li>
<li>然后在里面创建 <strong>advance-validators.ts</strong> 的ts文件</li>
<li>在 <strong>advance-validators.ts</strong> 里面编以下代码</li>
</ul>
<pre><code class="typescript">import { FormGroup } from &#39;@angular/forms&#39;;

export class AdvanceValidator {

    static matchingPasswords(passwordKey: string, rePasswordKey: string) {
    return (group: FormGroup) =&gt; {
      let password = group.controls[passwordKey]; //获取密码值
      let rePassword = group.controls[rePasswordKey]; //获取确认密码值

      if(password.value !== rePassword.value) {
        //如果密码和确认密码的值不一致就返回给FormBuild rePassword有错误
        return rePassword.setErrors({notEquivalent: true}) 
      }
    }
  }
}</code></pre>
<h1 id="前端表格示例"><a href="#前端表格示例" class="headerlink" title="前端表格示例"></a>前端表格示例</h1><pre><code class="html">&lt;form [formGroup] = &quot;passwordForm&quot;&gt;
  &lt;ion-list inset&gt;

    &lt;ion-item&gt;
      &lt;ion-input type=&quot;tel&quot; placeholder=&quot;用户名&quot; formControlName=&quot;username&quot;&gt;&lt;/ion-input&gt;
      &lt;div item-right *ngIf=&quot;!passwordForm.controls.username.valid  &amp;&amp; (passwordForm.controls.username.dirty)&quot;&gt;
        &lt;ion-icon name=&quot;alert&quot;&gt;&lt;/ion-icon&gt; 用户名必填
      &lt;/div&gt;
    &lt;/ion-item&gt;

    &lt;ion-item&gt;
      &lt;ion-input type=&quot;password&quot; placeholder=&quot;新密码&quot; formControlName=&quot;password&quot;&gt;&lt;/ion-input&gt;
      &lt;div item-right *ngIf=&quot;!passwordForm.controls.password.valid  &amp;&amp; (passwordForm.controls.password.dirty)&quot; &gt;
        &lt;ion-icon name=&quot;alert&quot;&gt;&lt;/ion-icon&gt; 密码必须7个字以上
      &lt;/div&gt;
    &lt;/ion-item&gt;

    &lt;ion-item&gt;
      &lt;ion-input type=&quot;password&quot; placeholder=&quot;确认密码&quot; formControlName=&quot;rePassword&quot;&gt;&lt;/ion-input&gt;
      &lt;div item-right *ngIf=&quot;!passwordForm.controls.rePassword.valid  &amp;&amp; (passwordForm.controls.rePassword.dirty)&quot; &gt;
        &lt;ion-icon name=&quot;alert&quot;&gt;&lt;/ion-icon&gt; 密码必须一致
      &lt;/div&gt;
    &lt;/ion-item&gt;

  &lt;/ion-list&gt;
&lt;/form&gt;</code></pre>

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